﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Office.Interop.Excel;
using System.Windows.Forms;
using System.IO;
using System.Reflection;

namespace IP_stream
{
    public class ExportExcel
    {
        //导出到EXCEL速度比较快的方法
        private static bool ExportForDataGridview(DataGridView gridView, string fileName, bool isShowExcle)
        {
            //建立Ｅｘｃｅｌ对象 
            Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();
            try
            {
                if (app == null)
                {
                    return false;
                }

                app.Visible = isShowExcle;
                Workbooks workbooks = app.Workbooks;
                _Workbook workbook = workbooks.Add(XlWBATemplate.xlWBATWorksheet);
                Sheets sheets = workbook.Worksheets;
                _Worksheet worksheet = (_Worksheet)sheets.get_Item(1);
                if (worksheet == null)
                {
                    return false;
                }
                string sLen = "";
                //取得最后一列列名 
                char H = (char)(64 + gridView.ColumnCount / 26);
                char L = (char)(64 + gridView.ColumnCount % 26);
                if (gridView.ColumnCount < 26)
                {
                    sLen = L.ToString();
                }
                else
                {
                    sLen = H.ToString() + L.ToString();
                }
                //名称
                worksheet.Name = fileName;
                //标题 
                string sTmp = sLen + "1";
                Range ranCaption = worksheet.get_Range(sTmp, "A1");
                string[] asCaption = new string[gridView.ColumnCount];
                for (int i = 0; i < gridView.ColumnCount; i++)
                {
                    asCaption[i] = gridView.Columns[i].HeaderText;
                }
                ranCaption.Value2 = asCaption;
                //数据 
                object[] obj = new object[gridView.Columns.Count];
                for (int r = 0; r < gridView.RowCount - 1; r++)
                {
                    for (int l = 0; l < gridView.Columns.Count; l++)
                    {
                        if (gridView[l, r].ValueType == typeof(DateTime))
                        {
                            obj[l] = gridView[l, r].Value.ToString();
                        }
                        else
                        {
                            obj[l] = gridView[l, r].Value;
                        }
                    }
                    string cell1 = sLen + ((int)(r + 2)).ToString();
                    string cell2 = "A" + ((int)(r + 2)).ToString();
                    Range ran = worksheet.get_Range(cell1, cell2);
                    ran.Value2 = obj;

                }
                //保存 
                //workbook.SaveCopyAs(fileName);
                //workbook.Saved = true;
            }
            finally
            {
                //关闭 
                //app.UserControl = false;
                //app.Quit();
            }
            return true;
        }
        #region DataGridView数据显示到Excel
        /// <summary>   
        /// 打开Excel并将DataGridView控件中数据导出到Excel  
        /// </summary>   
        /// <param name="dgv">DataGridView对象 </param>   
        /// <param name="isShowExcle">是否显示Excel界面 </param>   
        /// <remarks>  
        /// add com "Microsoft Excel 11.0 Object Library"  
        /// using Excel=Microsoft.Office.Interop.Excel;  
        /// </remarks>  
        /// <returns> </returns>   
        private static bool DataGridviewShowToExcel(DataGridView dgv, bool isShowExcle)
        {
            if (dgv.Rows.Count == 0)
                return false;
            //建立Excel对象   
            Microsoft.Office.Interop.Excel.Application excel = new Microsoft.Office.Interop.Excel.Application();
            excel.Application.Workbooks.Add(true);
            excel.Visible = isShowExcle;
            //生成字段名称   
            for (int i = 0; i < dgv.ColumnCount; i++)
            {
                excel.Cells[1, i + 1] = dgv.Columns[i].HeaderText;
            }
            //填充数据   
            for (int i = 0; i < dgv.RowCount - 1; i++)
            {
                for (int j = 0; j < dgv.ColumnCount; j++)
                {
                    if (dgv[j, i].ValueType == typeof(string))
                    {
                        excel.Cells[i + 2, j + 1] = "'" + dgv[j, i].Value.ToString();
                    }
                    else
                    {
                        excel.Cells[i + 2, j + 1] = dgv[j, i].Value.ToString();
                    }
                }
            }
            return true;
        }
        #endregion

        #region DateGridView导出到csv格式的Excel
        /// <summary>  
        /// 常用方法，列之间加\t，一行一行输出，此文件其实是csv文件，不过默认可以当成Excel打开。  
        /// </summary>  
        /// <remarks>  
        /// using System.IO;  
        /// </remarks>  
        /// <param name="dgv"></param>  
        public static void DataGridViewToExcel(DataGridView dgv)
        {
            SaveFileDialog dlg = new SaveFileDialog();
            dlg.Filter = "Execl files (*.xls)|*.xls";
            dlg.FilterIndex = 0;
            dlg.RestoreDirectory = true;
            dlg.CreatePrompt = true;
            dlg.Title = "保存为Excel文件";

            if (dlg.ShowDialog() == DialogResult.OK)
            {
                Stream myStream;
                myStream = dlg.OpenFile();
                StreamWriter sw = new StreamWriter(myStream, System.Text.Encoding.GetEncoding(-0));
                string columnTitle = "";
                try
                {
                    //写入列标题  
                    for (int i = 0; i < dgv.ColumnCount; i++)
                    {
                        if (i > 0)
                        {
                            columnTitle += "\t";
                        }
                        columnTitle += dgv.Columns[i].HeaderText;
                    }
                    sw.WriteLine(columnTitle);

                    //写入列内容  
                    for (int j = 0; j < dgv.Rows.Count; j++)
                    {
                        string columnValue = "";
                        for (int k = 0; k < dgv.Columns.Count; k++)
                        {
                            if (k > 0)
                            {
                                columnValue += "\t";
                            }
                            if (dgv.Rows[j].Cells[k].Value == null)
                                columnValue += "";
                            else
                                columnValue += dgv.Rows[j].Cells[k].Value.ToString().Trim();
                        }
                        sw.WriteLine(columnValue);
                    }
                    sw.Close();
                    myStream.Close();
                }
                catch (Exception e)
                {
                    MessageBox.Show(e.ToString());
                }
                finally
                {
                    sw.Close();
                    myStream.Close();
                }
            }
        }
        #endregion

        #region DataGridView导出到Excel，有一定的判断性
        /// <summary>   
        ///方法，导出DataGridView中的数据到Excel文件   
        /// </summary>   
        /// <remarks>  
        /// add com "Microsoft Excel 11.0 Object Library"  
        /// using Excel=Microsoft.Office.Interop.Excel;  
        /// using System.Reflection;  
        /// </remarks>  
        /// <param name= "dgv"> DataGridView </param>   
        private  static void DataGridViewToExcel2(DataGridView dgv)
        {


            #region   验证可操作性

            //申明保存对话框   
            SaveFileDialog dlg = new SaveFileDialog();
            //默然文件后缀   
            dlg.DefaultExt = "xls ";
            //文件后缀列表   
            dlg.Filter = "EXCEL文件(*.XLS)|*.xls ";
            //默然路径是系统当前路径   
            dlg.InitialDirectory = Directory.GetCurrentDirectory();
            //打开保存对话框   
            if (dlg.ShowDialog() == DialogResult.Cancel) return;
            //返回文件路径   
            string fileNameString = dlg.FileName;
            //验证strFileName是否为空或值无效   
            if (fileNameString.Trim() == " ")
            { return; }
            //定义表格内数据的行数和列数   
            int rowscount = dgv.Rows.Count;
            int colscount = dgv.Columns.Count;
            //行数必须大于0   
            if (rowscount <= 0)
            {
                MessageBox.Show("没有数据可供保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            //列数必须大于0   
            if (colscount <= 0)
            {
                MessageBox.Show("没有数据可供保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            //行数不可以大于65536   
            if (rowscount > 65536)
            {
                MessageBox.Show("数据记录数太多(最多不能超过65536条)，不能保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            //列数不可以大于255   
            if (colscount > 255)
            {
                MessageBox.Show("数据记录行数太多，不能保存 ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }

            //验证以fileNameString命名的文件是否存在，如果存在删除它   
            FileInfo file = new FileInfo(fileNameString);
            if (file.Exists)
            {
                try
                {
                    file.Delete();
                }
                catch (Exception error)
                {
                    MessageBox.Show(error.Message, "删除失败 ", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                    return;
                }
            }
            #endregion
            Microsoft.Office.Interop.Excel.Application objExcel = null;
            Microsoft.Office.Interop.Excel.Workbook objWorkbook = null;
            Microsoft.Office.Interop.Excel.Worksheet objsheet = null;
            try
            {
                //申明对象   
                objExcel = new Microsoft.Office.Interop.Excel.Application();
                objWorkbook = objExcel.Workbooks.Add(Missing.Value);
                objsheet = (Microsoft.Office.Interop.Excel.Worksheet)objWorkbook.ActiveSheet;
                //设置EXCEL不可见   
                objExcel.Visible = false;

                //向Excel中写入表格的表头   
                int displayColumnsCount = 1;
                for (int i = 0; i <= dgv.ColumnCount - 1; i++)
                {
                    if (dgv.Columns[i].Visible == true)
                    {
                        objExcel.Cells[1, displayColumnsCount] = dgv.Columns[i].HeaderText.Trim();
                        displayColumnsCount++;
                    }
                }
                //设置进度条   
                //tempProgressBar.Refresh();   
                //tempProgressBar.Visible   =   true;   
                //tempProgressBar.Minimum=1;   
                //tempProgressBar.Maximum=dgv.RowCount;   
                //tempProgressBar.Step=1;   
                //向Excel中逐行逐列写入表格中的数据   
                for (int row = 0; row <= dgv.RowCount - 1; row++)
                {
                    //tempProgressBar.PerformStep();   

                    displayColumnsCount = 1;
                    for (int col = 0; col < colscount; col++)
                    {
                        if (dgv.Columns[col].Visible == true)
                        {
                            try
                            {
                                objExcel.Cells[row + 2, displayColumnsCount] = dgv.Rows[row].Cells[col].Value.ToString().Trim();
                                displayColumnsCount++;
                            }
                            catch (Exception)
                            {

                            }

                        }
                    }
                }
                //隐藏进度条   
                //tempProgressBar.Visible   =   false;   
                //保存文件   
                objWorkbook.SaveAs(fileNameString, Missing.Value, Missing.Value, Missing.Value, Missing.Value,
                        Missing.Value, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlShared, Missing.Value, Missing.Value, Missing.Value,
                        Missing.Value, Missing.Value);
            }
            catch (Exception error)
            {
                MessageBox.Show(error.Message, "警告 ", MessageBoxButtons.OK, MessageBoxIcon.Warning);
                return;
            }
            finally
            {
                //关闭Excel应用   
                if (objWorkbook != null) objWorkbook.Close(Missing.Value, Missing.Value, Missing.Value);
                if (objExcel.Workbooks != null) objExcel.Workbooks.Close();
                if (objExcel != null) objExcel.Quit();

                objsheet = null;
                objWorkbook = null;
                objExcel = null;
            }
            MessageBox.Show(fileNameString + "\n\n导出完毕! ", "提示 ", MessageBoxButtons.OK, MessageBoxIcon.Information);

        }

        #endregion  
    }
}
